Screen.



No. 810,905. PATBNTED JAN. 30.1900. W. W. MGCALLIP.

SCREEN APPLICATION FILED 00T. 5.1904.

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No. 810,965, PATENTED JAN'. 3o, 1906.'

W. W. MGCALLIP. SCREEN.

APPLICATION FILED 00T. 5, 1904.

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Www/@awo @mm1/Lto@ NITED STATES PATENT OFFICIn Specication of Letters Patent.

Patented J an. 430, 1906.

Application filed October 5. l1904. Serial No. 227,226.

To alt whom it may concern.' v

Be it known that I, WILLIAM W. MCCALLIP,

i a citizen of the United States, residing at Columbus, in the countyl of Franklin and State of Ohio, have invented certain new and useful Im rovements in Screens; and I do hereby dec are the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the uniformly varied as to its size and shape to screen coarser or finer, as may be desired.

The invention is embodied in the combination of an adjustable frame or housing have ing its sides adjustable without altering the angular relation of the sides to each other and a screening fabric supported by said frame or housing; but the exact boundaries of the invention areto be gathered from the claims in connection with the prior art.

In the accompanying drawings, in vwhich I have illustrated but one embodiment of the invention,l Figure 1 is a view in elevation of the upper or front side of the device. Fig. 2 is a cross-section of the frame and the'operative parts, taken, for example, on the plane Fig. 1, looking up. Fig. 3 is a side or edge view showing one way in which-the screen can be supported for practical use.

The main portion of the frame, as shown, is comprised of parallel angle-rails 1 1 and a foot-bar 2, also of angle form, in which the lower ends of the rails 1 1 are supported and move.

3 3 and 4 4 are loose blocks resting on the edges of the screening fabric where it extends onto the angle-rails 1 1. attached to their upper ends angle-bars 5 5, that lap at their inner portions, so as to be slidable on each other. These lapped anglebars support the upper edge of the screening fabric. The loose bars 3 3 .and 4 4 canb'e pressed and held down against the side edges of the screening fabric by means of straps 6, with screws 6a embracing the rails 1 1 and blocks 3 3 and 4 4. The blocks 3 3 and 4 4, together with the straps 6, can be viewed as clamping devices. clamped embrace the rails 1 1, are shown to be provided with hooks 6b to enter and engage the mesh of the screening fabric. lWhen The blocks 3 3 have The straps 6, which until' the fabric is to be expanded laterally, the v hooks 6b, upon the operation of screws here;` inafter referred to, draw on the edges of the fabric outward to effect its expansion and the straps 6 slide a little longitudinally on the rails 1 1. At the rear or under side of the rails 1 1 are two transversely-arranged corresponding screws 7 7, connected by a sprocket? chainS, so that the operation of one screw (as by the crank 8a on' the upper screw) effects the operation of both. n

The screening fabric is designated 9. This is a woven piece of rectangular form, the strands being free to move on each other at their intersections. Fabric of the kind shown is called diamond-mesh fabric because Its strands are permanently inclined to the edges of the piece and movable on each other. It will be observed that with this form of fabric it is practicable to lengthen. or widen the piece without materially altering the rectangular character thereof. Moreover, While the mesh in this sort of fabric may be uniformly changed as to its size and form the uniformity of the opening of the mesh throughout the piece is not readily disturbed by rough usage. The screen is operated as follows: The blocks 3 3 and 4 4 are first loosened by loosening the screws 6a, so as to relieve the pressure of the blocks on the edges of the fabric. The screws 7 7 are then turned in the proper d1- rection to separate or draw together, as may be desired, the rails 1 1. If the rails 1 1 are separated, the hooks 6b draw on the edges of the fabric and enlarge the mesh, the bars 3 3 being also drawn down, because the fabric 1s contracted longitudinally and supported at the bottom. If the rails 1`1 be drawn toward each other, they press the edges of the fabric toward each other and the bars 3 3 are carried by the upper end of the fabric upward, because the fabric is supported at the bottom and the fabric elongated longitudinally. After the rails 1 1 have been adjusted to obtain the desired character of mesh the bars 3 3 and 4 4 are clamped down on the edges of the fabric to hold it in place.

The forms of the parts can be changed within the domain of mechanical skill without departing from the scope of the invention. For example, means other than screws can be used to operate the rails 1 1.

What I claim, and desire to secure by Letters Patent, is-

1. In a screen, the combination of parallelly-adjustable side supports, and a screen- IOO IIO

ingfabric the strands composing which are permanently inclined to the edges thereof on said supports whereby said fabric is adjustable longitudinally and laterally Without altering the angular relation of the edges thereof to each other. j

2. In a screen, the combination of a rectan ular frame having its opposite sides aralle ly adjustable with respect to each ot er, and a screening fabric the strands composing which are permanently inclined to the edges thereof on said frame whereby said fabric is adjustable longitudinally and laterally without altering the angular relation of the edges thereof to each other.

3. In a screen, the combination of paralle side supports, means for adjusting them toward and from each other, a screening fabric adjustable longitudinally and laterally on the supports without alteringthe angular relation to each other ofthe sides of the fabric and movable clamping devices for holding the edges of the fabric on the supports.

4. In a screen, the combination of parallel side supports, means for adjusting them toward and from each other, a screen adjustable longitudinally and laterally on the supports, movable clamping devices for holding the edges of the screen on the supports, and hooks for engaging the screen.

In testimony whereof I affix my signature in presence of two witnesses.

WILLIAM W. MGCALLIP.

Witnesses:

WM. NURNBERGER, GEORGE M. FINGKEL. 

